US4984495A - Musical tone signal generating apparatus - Google Patents

Musical tone signal generating apparatus Download PDF

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Publication number
US4984495A
US4984495A US07/350,107 US35010789A US4984495A US 4984495 A US4984495 A US 4984495A US 35010789 A US35010789 A US 35010789A US 4984495 A US4984495 A US 4984495A
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Prior art keywords
musical tone
sampling data
signal
waveform
data
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US07/350,107
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English (en)
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Junichi Fujimori
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Yamaha Corp
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Yamaha Corp
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H7/00—Instruments in which the tones are synthesised from a data store, e.g. computer organs
    • G10H7/08—Instruments in which the tones are synthesised from a data store, e.g. computer organs by calculating functions or polynomial approximations to evaluate amplitudes at successive sample points of a tone waveform
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/0091—Means for obtaining special acoustic effects
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/02—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos
    • G10H1/04—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos by additional modulation
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H2210/00—Aspects or methods of musical processing having intrinsic musical character, i.e. involving musical theory or musical parameters or relying on musical knowledge, as applied in electrophonic musical tools or instruments
    • G10H2210/155—Musical effects
    • G10H2210/265—Acoustic effect simulation, i.e. volume, spatial, resonance or reverberation effects added to a musical sound, usually by appropriate filtering or delays
    • G10H2210/281—Reverberation or echo
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H2250/00—Aspects of algorithms or signal processing methods without intrinsic musical character, yet specifically adapted for or used in electrophonic musical processing
    • G10H2250/131—Mathematical functions for musical analysis, processing, synthesis or composition
    • G10H2250/145—Convolution, e.g. of a music input signal with a desired impulse response to compute an output
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S84/00—Music
    • Y10S84/26—Reverberation

Definitions

  • the present invention relates to a musical tone signal generating apparatus which can be used for an electronic musical instrument, toys and the like, and more particularly to a musical tone signal generating apparatus in which a waveform signal is modulated such that a desirable musical effect will be applied to a musical tone to be generated or so that the modulated waveform signals are combined together into a new musical tone signal.
  • the conventional apparatus modulates the musical tone signal with the waveform signal having a low frequency in an amplitude modulation, phase modulation, frequency modulation or the like, so that the musical effect such as a tremolo, ensemble and the like can be obtained. Or, this conventional apparatus circulatingly delays the musical tone signal such that the reverberation effect or echo effect can be obtained.
  • the modulation or delay is monotonous so that the musical tone to be generated must be short of the massiveness, thickness or depth in the music (hereinafter, referred to as a musical thickness). Therefore, the listener may feel unsatisfied with such musical tone.
  • a musical tone signal generating apparatus comprising:
  • acoustic converting means for converting an acoustic signal into an analog signal, wherein the acoustic signal indicates acoustics of an externally picked-up musical tone
  • analog-to-digital converting means for sequentially converting instantaneous values of the analog signal into a digital signal by every predetermined time
  • a musical tone signal generating apparatus comprising:
  • a musical tone signal generating apparatus comprising:
  • acoustic converting means for converting an acoustic signal into an analog signal, wherein the acoustic signal indicates acoustics of an externally picked-up musical tone
  • analog-to-digital converting means for sequentially converting instantaneous values of the analog signal into a digital signal by every predetermined time, the digital signal being outputted as second sampling data;
  • a musical tone signal generating apparatus comprising:
  • waveform storing means for storing second sampling data indicative of instantaneous amplitude values of another musical tone waveform
  • musical tone signal generating apparatus comprising:
  • waveform storing means for storing second sampling data indicative of instantaneous amplitude values of another musical tone waveform
  • tone forming means for forming a musical tone signal based on an output of the operating means.
  • a musical tone signal generating apparatus comprising:
  • tone forming means for forming a musical tone signal based on an output of the operating means.
  • FIG. 1 is a circuit diagram showing a basic configuration for a convolution operation control according to the present invention
  • FIG. 2 is a block diagram showing an electronic musical instrument which adopts the musical tone signal generating apparatus according to an embodiment of the present invention
  • FIG. 3 is a block diagram showing a detailed electric configuration of a convolution operation circuit shown in FIG. 2;
  • FIGS. 4, 6, 8 and 9 show time charts which are used for explaining operations of the electronic musical instrument shown in FIG. 2;
  • FIGS. 5, 7, 10 and 11 show memory maps which are used for explaining reading/writing operations of a memory shown in FIG. 2.
  • FIG. 1 is a circuit diagram showing the electric circuit which is used as the convolution operation control.
  • This circuit shown in FIG. 1 consists of n-stage circuits which include n pairs of delay circuits 1 1 , 1 2 , . . . , 1 n and 2 1 , 2 2 , . . . , 2 n , (n+1) multipliers 3 0 , 3 1 , 3 2 , . . . , 3 n , and n adders 4 1 , 4 2 , . . . , 4 n .
  • the delay circuit 1 1 inputs sampling data A(t) indicative of an instantaneous value of a first continuous waveform signal which is taken by every delay time dt (where d means delta ⁇ ).
  • Each of the delay circuits 1 1 , 1 2 , . . . , 1 n delays its input signal by the delay time dt, whereby these delay circuits 1 1 , 1 2 , . . . , 1 n output sampling data A(t-dt), A(t-2dt), . . . , A(t-ndt) respectively.
  • Another delay circuit 2 1 inputs sampling data B(t) indicative of an instantaneous value of a second continuous waveform signal which is taken by every delay time dt.
  • Each of the delay circuits 2 1 , 2 2 , . . . , 2 n delays its input signal by the delay time dt, whereby these delay circuits 2 1 , 2 2 , . . . , 2 n output sampling data B(t-dt), B(t-2dt), . . . , B(t-ndt) respectively.
  • the multipliers 3 0 , 3 1 , 3 2 , . . . , 3 n multiplies the sampling data A(t), A(t-dt), A(t-2dt), . . . , A(t-ndt) by B(t), B(t-dt), B(t-2dt), . . .
  • the adders 4 1 , 4 2 , . . . , 4 n sequentially add the outputs of multipliers 3 0 , 3 1 , 3 2 , . . . , 3 n together to thereby output an output signal C(t).
  • this output signal C(t) can be expressed as follows.
  • the output signal C(t) means the result of the convolution operation between the inputs A(t) and B(t).
  • the input A(t) can be set as the musical tone waveform signal whose amplitude is continuously varied in lapse of time.
  • the sequential delay operation i.e., shift operation
  • the musical tone waveform signal is applied with the modulation due to the convolution operation based on the input B(t). Therefore, when the impulse response waveform signal indicative of the reverberation characteristic in the room is adopted as the input B(t), it is possible to obtain the musical tone signal to which the reverberation characteristic is applied. On the other hand, when another waveform signal is adopted as the input B(t), it is possible to obtain the musical tone signal to which the brand-new musical effect is applied.
  • the waveform signal whose amplitude continuously varies in lapse of time can be adopted as the input B(t), while the sequential delay operation of the sampling data B(t-dt), B(t-2dt), . . . , B(t-ndt) at the delay circuits 2 1 , 2 2 , . . . , 2 n is continued.
  • the input A(t) as the musical tone waveform signal is dynamically modulated by the convolution operation based on the input B(t). As a result, it is possible to give the brand-new and complicated modulation effect to the musical tone signal.
  • FIG. 2 is a block diagram showing the whole configuration of the keyboard electronic musical instrument.
  • This electronic musical instrument includes a key switch circuit 12 consisting of plural key switches each corresponding to each of plural keys in a keyboard 11.
  • a key-depression detecting circuit 13 detects depression/release operation of each key of the keyboard 11.
  • the circuit 13 outputs key information indicative of the key which is depressed or released, and then this key information is supplied to a main waveform data generating circuit 14 and a sub-waveform data generating circuit 15.
  • the main waveform data generating circuit 14 Based on the key information, the main waveform data generating circuit 14 forms a first continuous musical tone waveform signal having a pitch frequency of the depressed key in the keyboard 11. Then, this circuit 14 outputs sampling data indicative of the instantaneous value of the first continuous musical tone waveform signal to a convolution operation circuit 16 as a waveform signal A.
  • the sub-waveform data generating circuit 15 forms a second continuous musical tone waveform signal having the pitch frequency of the depressed key based on the key information. Then, this circuit 15 output sampling data indicative of the instantaneous value of the second continuous musical tone waveform signal which is different from the waveform signal A, and this sampling data is supplied to a first input ("1") of a selector 17.
  • it is possible to adopt several known methods such as the waveform memory reading method, higher harmonic waveform combining method, operation method and the like.
  • an analog-to-digital (A/D) converter 18 is connected to a second input ("0") of the selector 17.
  • the A/D converter 18 converts an analog signal supplied from a microphone 21 into a digital signal, so that the A/D converter 18 outputs this digital signal to the second input of the selector 17 as sampling data indicative of the instantaneous value of the tone which is externally picked up by the microphone 21 (hereinafter, referred to as an external tone).
  • the selector 17 selectively outputs one of two sampling data to the convolution operation circuit 16 as a waveform signal B based on a second mode signal MD2 which is supplied to a selection control terminal SL thereof.
  • the second mode signal MD2 takes the value "1"
  • the sampling data from the subwaveform data generating circuit 15 is selected.
  • the second mode signal MD2 takes the value "0”
  • another sampling data from the A/D converter 18 is selected.
  • This second mode signal MD2 is outputted from a mode selecting switch 22.
  • This mode selecting switch 22 also outputs first and third mode signals MD1 and MD3. Based on the selecting operation of the mode selecting switch 22, any one of the mode signals MD1 to MD3 selectively takes the value "1".
  • these mode signals MD1, MD2 and MD3 respectively correspond to the following first, second and third modes which are set in the keyboard electronic musical instrument.
  • the impulse response waveform signal is inputted from the external device. Then, the convolution operation is executed between this impulse response waveform signal and the waveform signal A from the main waveform data generating circuit 14 so that the output musical tone waveform signal is formed. In addition, the convolution operation based on the pre-stored waveform data whose waveform is fixed is executed so that the output musical tone waveform signal is formed, wherein the impulse response waveform data can be applied to this waveform data.
  • the convolution operation is executed between the waveform signal A from the main waveform data generating circuit 14 and another waveform signal B from the sub-waveform data generating circuit 15 so that the output musical tone waveform signal is formed.
  • the convolution operation is executed between the waveform signal A and the external tone signal from the microphone so that the output musical tone waveform signal is formed, wherein the amplitude of waveform signal A may continuously vary in lapse of time but the amplitude of external tone signal may intermittently vary in lapse of time.
  • the convolution operation circuit 16 executes the convolution operation between the waveform signals A and B corresponding to the mode to be set, whereas the detailed description of the convolution operation circuit 16 will be described later.
  • this circuit 16 generates a series of sampling data each indicating the instantaneous value of the output musical tone waveform.
  • This sampling data is supplied to a digital-to-analog (D/A) converter 23 as an output waveform signal C, wherein the sampling data is converted into the analog signal which is to be supplied to a sound system 24.
  • the sound system 24 comprises an amplifier, speaker and the like so that it generates the musical tone corresponding to the analog signal outputted from the D/A converter 23.
  • the present keyboard electronic musical instrument further includes an impulse generator 25 and a level detecting circuit 26 in order to generate the impulse signal and also input the impulse response waveform signal into the convolution operation circuit 16.
  • an AND circuit 28 inputs the first mode signal MD1 and "1" signal to be supplied thereto via an operation switch 27 which is used for generating the impulse, so that the output thereof is to be supplied to the impulse generator 25.
  • the impulse generator 25 outputs a pulse signal whose cycle is in synchronism with the leading edge of the output of AND circuit 28.
  • the impulse generator 25 is connected to a speaker 32 via an amplifier 31.
  • the pulse signal from the impulse generator 25 is converted into the acoustic signal, so that the speaker 32 generates the sound corresponding to the acoustic signal.
  • the A/D converter 18 is connected to the level detecting circuit 26.
  • the level detecting circuit 26 detects that the output signal level of the A/D converter 18 exceeds over the predetermined level by inputting the external tone via the microphone 21, this circuit 26 outputs a pulse signal to a first input of AND circuit 33.
  • the output of AND circuit 28 is supplied to a second input of the AND circuit 33.
  • the AND circuit 33 supplies a sampling start signal SMPS to the convolution operation circuit 16, wherein this sampling start signal SMPS consists of the pulse signals each of which is in synchronism with the time when the external tone (i.e., impulse response signal) is started to be inputted.
  • the present keyboard electronic musical instrument further comprises a waveform data storing control circuit 34 in order to restore the waveform data concerning the externally picked-up impulse response waveform signal or use the predetermined waveform data for the convolution operation instead of the waveform signal B in the convolution operation circuit 16, wherein this circuit 34 controls the data transfer with the convolution operation circuit 16.
  • This circuit 34 is connected to the convolution operation circuit 16 via a bus 35 which transmits a memory address signal MADR, a memory read/write control signal MR/W and a memory enable signal MEN. Based on these signals, the transfer of memory waveform data MDAT for the convolution operation circuit 16 is controlled.
  • the waveform data storing control circuit 34 is connected with a waveform data memory 36 configured by a random-access memory (RAM).
  • an external storing unit 37 such as a magnetic disk unit or a magnetic tape unit can be connected to the waveform data storing control circuit 34.
  • the waveform data storing control circuit 34 is connected with a designating unit 38 including plural operation switches. This designating unit 38 controls the read/write operation of waveform data for the waveform data memory 36 and external storing unit 37.
  • a master clock signal Cm and a read/write control signal R/W from the convolution operation circuit are supplied to several circuits within the present keyboard electronic musical instrument according to needs.
  • the synchronizing operation of each circuit is controlled.
  • the convolution operation circuit 16 as shown in FIG. 3 comprises: a first waveform data storing portion WM1 for storing each of first sampling data which form the waveform signal A; a second waveform data storing portion WM2 for storing each of second sampling data which form the waveform signal B; a calculation portion CAL for executing the convolution operation; a timing control portion TMCON for controlling the operation timings at the whole parts of the keyboard electronic musical instrument; an address control portion ADCON for controlling the read/write operations of each sampling data in the first and second waveform data storing portions WM1 and WM2; and a sampling control portion SMPCON for controlling the input of impulse response waveform signal.
  • the first waveform data storing portion WM1 includes a memory 41 consisting of the RAM having N storing areas.
  • a data input/output terminal DATA of this memory 41 is connected to a bus 42, while a read/write control signal R/W (see FIG. 4) from the timing control portion TMCON is supplied to a read/write control terminal R/W thereof.
  • R/W read/write control signal
  • the signal R/W takes the value "1”
  • the reading operation of sampling data from the memory 41 is controlled.
  • the signal R/W takes the value "0”
  • the input side of bus 42 is connected to a gate circuit 43 whose gate control terminal GC is connected to an inverter 44.
  • an inverted read/write control signal R/W is supplied to the gate control terminal GC of the gate circuit 43.
  • this inverted read/write control signal R/W takes the value "1”
  • the gate circuit 43 is turned on so that the first sampling data for the waveform signal A is transmitted to the bus 42.
  • the output side of bus 42 is connected with another gate circuit 45.
  • the gate circuit 45 is turned on so that the sampling data on the bus 42 is transmitted to the calculation portion CAL.
  • an output terminal of a selector 46 is connected to an address input ADR of the memory 41, wherein this selector 46 is controlled by the read/write control signal R/W supplied to a selection control terminal SL thereof.
  • the selector 46 selects a write address signal WADR from the address control portion ADCON.
  • the selector 46 selects a review (or rewinding) read address signal READR from the address control portion ADCON.
  • the second waveform data storing portion WM2 includes a memory 47 consisting of the RAM having N storing areas.
  • a data input/output terminal DATA of this memory 47 is connected to a selector 48 whose selection control terminal SL is supplied with a memory enable signal MEM outputted from the waveform data storing control circuit 34 (see FIG. 2).
  • this signal MEM takes the value "0”, it is permitted that the sampling data is transferred between the memory 47 and a bus 51.
  • this signal MEM takes the value "1”
  • the sampling data i.e., memory waveform data MDATA
  • the input side of bus 51 is connected to a gate circuit 52 whose gate control terminal GC is supplied with an output of OR circuit 53.
  • OR circuit 53 When the output of OR circuit 53 takes the value "1”, the gate circuit 52 is turned on so that the second sampling data for the waveform signal B is transmitted onto the bus 51.
  • the output side of bus 51 is connected to another gate circuit 54 whose gate control terminal GC is supplied with an output of an inverter 55 to which the output of OR circuit 53 is supplied.
  • the gate circuit 54 is turned on so that the sampling data on the bus 51 is transmitted to the calculation portion CAL.
  • the first input of OR circuit 53 is supplied with an output of AND circuit 56.
  • the inverted read/write control signal R/W from an inverter 57 is supplied to the first input of AND circuit 56, while an output of OR circuit 58 is supplied to the second input of AND circuit 56, wherein the second and third mode signals MD2 and MD3 are supplied to the OR circuit 58. Therefore, when the second or third mode is set in the present keyboard electronic musical instrument, the OR circuit 53 outputs the inverted read/write control signal R/W.
  • an output of AND circuit 61 is supplied to a second input of the OR circuit 53.
  • This AND circuit 61 is supplied with the inverted read/write control signal R/W, the first mode signal MD1 and a sample/hold signal S/H from the sampling control portion SMPCON.
  • the OR circuit 53 outputs the inverted read/write control signal R/W under the condition where the sample/hold signal S/H takes the value "1".
  • an output of a NOR circuit 62 is supplied to a read/write control terminal R/W of the memory 47.
  • the reading operation of this memory 47 is controlled when the output of NOR circuit 62 takes the value "1", while the writing operation thereof is controlled when it takes the value "0".
  • a first input of this NOR circuit 62 is supplied with an output of AND circuit 63.
  • the output of OR circuit 53 is supplied to a first input of the AND circuit 63, while an output of inverter 64 is supplied to a second input of the AND circuit 63.
  • the memory enable signal MEN is supplied to the inverter 64 so that an inverted memory enable signal MEN is supplied to the second input of AND circuit 63.
  • an output of selector 67 is supplied to an address input terminal ADR of the memory 47.
  • This selector 67 is controlled by the memory enable signal MEN supplied to a selection control terminal SL thereof, wherein this memory enable signal MEN is outputted from the waveform data storing control circuit 34 (shown in FIG. 2).
  • the selector 67 selects an output of selector 68 when the memory enable signal MEN takes the value "0", while the selector 67 selects the memory address signal MADR from the waveform data storing control circuit 34 when it takes the value "1".
  • the selector 68 is controlled by the read/write control signal R/W supplied to a selection control terminal SL thereof.
  • This selector 68 selects the write address signal WADR from the address control portion ADCON when the signal R/W takes the value "0", while the selector 68 selects a forward read address signal READF from the address control portion ADCON when the signal R/W takes the value "1".
  • the calculation portion CAL includes a multiplier 71 which is connected with the gate circuits 45 and 54.
  • This multiplier 71 multiplies the outputs of gate circuits 45 and 54 together, so that the multiplication result is supplied to a first input of adder 73.
  • the adder 73 and a register 72 configures an accumulator. Then, an output of this register 72 is supplied to a second input of the adder 73. Therefore, the adder 73 adds the multiplication result from the multiplier 71 and the output of register 72 together, so that the addition result of adder 73 is supplied to the input of register 72.
  • the register 72 is reset by an output of inverter 74 (i.e., inverted read/write control signal R/W) supplied to a reset terminal R thereof, while the register 72 renews and then stores the output of adder 73 in synchronism with the master clock signal Cm supplied to a load terminal LD thereof. Thereafter, a register 75 renews and then stores the output of register 72 every time the inverted read/write control signal R/W is supplied to a load terminal LD thereof.
  • inverter 74 i.e., inverted read/write control signal R/W
  • the timing control portion TMCON includes a master clock generator 76 which generates the master clock signal Cm (see FIG. 4) having high frequency.
  • This master clock signal Cm is supplied to a counter 77 and other circuits, whereby the basic operation timings of several circuits are controlled by the master clock signal Cm.
  • This counter 77 is designed as the modulo N+1 counter, so that it repeatedly counts up the values between "0" and "N”.
  • a decoder 78 is connected to the counter. When the decoder 78 detects that the counter 77 counts the value "N", the decoder 78 outputs the "1" signal.
  • Such output of decoder 78 is inverted by an inverter 81, so that the inverted output of decoder 78 is used as the foregoing read/write control signal R/W.
  • the value of this read/write control signal R/W turns to "0" every time the counter 77 counts N+1 master clocks in the master clock signal Cm. In the present embodiment, such N+1 clock period corresponds to one sampling time.
  • the address control portion ADCON provides a modulo N counter 82 and a modulo N+1 counter 83.
  • the above-mentioned read/write control signal R/W is inverted by an inverter, and then the inverted read/write control signal R/W is delayed by one master clock period in a delay circuit 85.
  • Such output of delay circuit 85 is supplied to a clock input terminal CK of the counter 82, whereby the counter 82 repeatedly counts up so that the counter 82 outputs the write address signal WADR (see FIG. 4) whose value varies from "0" to "N-1" by every sampling time.
  • this counter 82 is reset by the foregoing sampling start signal SMPS supplied to a reset terminal R thereof.
  • the output of delay circuit 85 is supplied to a reset terminal R of the counter 83, while the master clock signal Cm is supplied to a clock input terminal CK thereof.
  • the count value of counter 83 is reset to "0" in synchronism with the counting operation of the counter 82.
  • This counter 83 outputs the count value which varies from "0" to "N" within one sampling time.
  • the outputs of these counters 82 and 83 are both supplied to an adder 86 and a subtractor 87.
  • the adder 86 adds the write address signal WADR from the counter 82 and the output of counter 83 together to thereby obtain the addition result, which is then outputted to a first input of selector 88.
  • the output of counter 83 is supplied to a second input of the selector 88.
  • This selector 88 is controlled by the first mode signal MD1 supplied to a selection control terminal SL thereof.
  • the selector 88 selectively outputs the addition result from the adder 86 as the forward read address signal READF when the first mode signal MD1 takes the value "0", while the selector 88 selectively outputs the output of counter 88 as the signal READF when it takes the value "1".
  • the subtractor 87 subtracts the count value of counter 83 and value "1" from the value of write address signal WADR from the counter 82 to thereby obtain the subtraction result, which is then outputted as the review read address signal READR.
  • the sampling control portion SMPCON provides a modulo N+1 counter 91 and a decoder 92.
  • the sampling start signal SMPS is supplied to a reset terminal R of the counter 91, while an output of AND circuit 93 is supplied to a clock input terminal CK of the counter 91.
  • This AND circuit 93 inputs the sample/hold signal S/H and the output of delay circuit 85. Therefore, the count value of counter 91 is reset to "0" when the sampling start signal SMPS is supplied thereto.
  • the counter 91 counts up by every sampling time.
  • the decoder 92 detects that the count value of counter 91 becomes equal to "N”
  • the decoder 92 output the "1" signal.
  • Such output of decoder 92 is inverted by an inverter 94, so that the inverted output of decoder 92 is used as the sample/hold signal S/H.
  • first mode the convolution operation of the waveform signal A is executed by mainly using the impulse response waveform signal.
  • value of first mode signal MD1 is only set to "1" but other values of second and third mode signals MD2 and MD3 are set to "0".
  • the waveform data concerning the impulse response signal is inputted into the present keyboard electronic musical instrument.
  • the player turns on the operation switch 27.
  • the AND circuit 28 outputs the "1" signal to the impulse generator 25, from which the pulse signal is outputted via the amplifier 31.
  • this pulse signal is converted into the acoustic signal, so that the sound according to the acoustic signal is generated from the speaker 32 in the room where the present keyboard electronic musical instrument is placed.
  • the sound corresponding to the acoustic signal (i.e., impulse signal) is partially reflected and partially absorbed by the walls and some objects placed in the room, and thereafter such sound is partially picked up by the microphone 21.
  • the microphone 21 generates the analog waveform signal indicative of the impulse response of the room, and this analog waveform signal is supplied to the A/D converter 18.
  • the A/D converter 18 converts the instantaneous value of the analog waveform signal into the digital signal by every sampling time (see FIG. 4).
  • This digital signal is outputted to the selector 17 as the sampling data concerning the impulse response waveform signal by every sampling period.
  • the second mode signal MD2 takes the value "0". Therefore, the selector 17 outputs the sampling data from the A/D converter 18 to the convolution operation circuit 16 as the waveform signal B.
  • the above digital signal from the A/D converter 18 is also supplied to the level detecting circuit 26.
  • this circuit 26 detects the digital signal whose level is larger than the predetermined level, it outputs the pulse signal at the head timing of one sampling time, wherein this pulse signal indicates the start timing of inputting the impulse response waveform signal. In fact, this pulse signal is generated at the almost same time when the impulse signal is outputted.
  • the operation switch 27 is still on so that the AND circuit 28 outputs the "1" signal. Therefore, the pulse signal from the level detecting circuit 26 is supplied to the convolution operation circuit 16 as the sampling start signal SMPS (see FIG. 4) via the AND circuit 33.
  • the sampling start signal SMPS resets the counter 91 within the sampling control portion SMPCON so that the decoder 92 outputs the "0" signal which turns the sample/hold signal S/H to the "1" signal.
  • This sample/hold signal S/H having value "1” is supplied to the AND circuit 61. Since the first mode signal MD1 supplied to the AND circuit 61 takes the value "1", the inverted read/write control signal R/W is supplied to the gate circuit 52 via the AND circuit 61 and OR circuit 53. Thus, the gate circuit 52 will be turned on at every last timing of each sampling time.
  • the selector 48 permits the data transfer between the bus 51 and the data input/output terminal DATA of memory 47.
  • the waveform signal B i.e., the sampling data indicative of the impulse response waveform signal
  • the AND circuit 63 supplies the inverted read/write control signal R/W from the OR circuit 53 to the NOR circuit 62.
  • This NOR circuit 62 further inverts the inverted signal R/W to thereby output the read/write control signal R/W to the read/write control terminal R/W of the memory 47. This turns the mode of memory 47 into the write mode at every last timing of each sampling time so that the sampling data will be written into the memory 47.
  • the above-mentioned sampling start signal SMPS resets the counter 82. Therefore, after this signal SMPS is generated, the counter 82 outputs the write address signal WADR whose value increments from "0" by every sampling period as shown in FIG. 4.
  • WADR write address signal
  • Such write address signal WADR is supplied to the "0" terminal of selector 68 so that the selector 68 supplies this signal WADR to the "0" terminal of selector 67 based on the read/write control signal R/W at every last timing of each sampling time.
  • the memory enable signal MEN takes the value "0" as described before, so that the selector 67 supplies the output signal of selector 68 to the address input ADR of memory 47.
  • the foregoing write address signal WADR is supplied to the address input ADR of memory 47.
  • the sampling data indicative of the impulse response waveform is sequentially stored in each address of memory 47 from its address 0 by every sampling time.
  • the decoder 92 When the count value of counter 91 within the sampling control portion SMPCON reaches at "N" while above sampling data is written into the memory 47, the decoder 92 outputs the "1" signal which turns the sample/hold signal S/H to "0" signal. Such sample/hold signal S/H stops the counting operation of counter 91, so that the value thereof remains at “0". In addition, this sample/hold signal S/H having value "0” makes the AND circuit 61 to output the "0" signal. At this time, the operation of writing the sampling data into the memory 47 is stopped. Incidentally, the counter 82 operates in synchronism with the counter 91. Therefore, at this timing, the value of write address signal WADR reaches at "N-1", so that the sampling data are written into all areas (i.e., addresses 0 to N-1) of the memory 47.
  • this key-depression is detected by the key switch circuit 12 and key-depression detecting circuit 13, so that the key information concerning the key-depression is supplied to the main waveform data generating circuit 14.
  • the main waveform data generating circuit 14 forms the musical tone waveform signal having the pitch frequency of depressed key.
  • the sampling data indicative of the instantaneous value of this musical tone waveform signal is supplied to the convolution operation circuit 16 as the waveform signal A (see FIG. 6) in synchronism with the read/write control signal R/W.
  • the gate circuit 43 within the first waveform data storing portion WM1 is turned on by the inverted read/write control signal R/W which has been inverted by the inverter 44. Therefore, the gate circuit 43 supplies each of first sampling data for the waveform signal A to the data input/output terminal DATA of memory 41 by every last timing of each sampling time.
  • the read/write control signal R/W controls the selector 46 such that the write address signal WADR from the counter 82 is supplied to the address input ADR of memory 41.
  • this signal R/W also controls the memory 41 such that the mode of memory 41 is turned into the write mode.
  • the value of write address signal WADR increments from “0" to "N-1" in one sampling time. Therefore, as shown in FIG. 7, the address of memory 41 in which the first sampling data for the waveform signal A is written is incremented from “0". But, when the address of memory 41 reaches at N-1 address, the address number turns to "0". In such manner, the sampling data are sequentially stored in the memory 41. Thus, every time the new sampling data is supplied to the data input/output terminal DATA of memory 41, the oldest sampling data stored in the memory 41 is rewritten by the new sampling data. In other words, the memory 41 circulatingly stores the first sampling data indicative of the waveform signal A.
  • the sampling data are sequentially read from the memory 41 at the timings other than the last timing of each sampling time. More specifically, as shown in FIG. 6, the read/write control signal R/W takes the value "1" at the clock timings indicative of the count values "0" to "N-1" within one sampling time.
  • This signal R/W is supplied to the terminal R/W of the memory 41 so that the read mode is set to the memory 41.
  • this signal R/W is also supplied to the gate control terminal GC of gate circuit 45 so that the gate circuit 45 is turned on.
  • this signal R/W is supplied to the selection control terminal SL of selector 46, whereby this signal R/W controls the selector 46 such that the review read address signal READR is supplied to the address input ADR of memory 41 at the clock timings "0" to "N-1".
  • the sampling data stored in the memory 41 are sequentially read out in response to the review read address signal READR at the clock timings "0" to "N-1" in one sampling time.
  • the above review read address signal READR is formed in the subtractor 87.
  • the value of write address signal WADR from the counter 82 is incremented by every master clock.
  • this write address signal WADR takes the value "i”
  • its value changes in the order of "i-1", "i-2", . . . , "i” by every clock timing as shown in FIGS. 6 and 7.
  • the sampling data has not been written into address i of the memory 41, hence, the newest sampling data is stored in address i-1 of the memory 41. Therefore, as the address number becomes smaller, the older sampling data is written in. For this reason, the oldest sampling data is written into address i of the memory 41.
  • the sampling data to be read becomes older by every clock timing.
  • Such read sampling data are sequentially written into the first input of multiplier 71.
  • the selector 48 permits the data transfer between the bus 51 and data input/output terminal DATA of memory 47.
  • the read mode is set to the memory 47.
  • the sampling data is read from the memory 47, and this read sampling data is supplied to the second input of multiplier 71 via the selector 48, bus 51 and gate circuit 54.
  • the selector 68 supplies the forward read address signal READF from the selector 88 to the "0" input of selector 67 at the clock timings "0" to "N-1" in one sampling time.
  • the selector 88 Based on the first mode signal MD1 whose value is set to “1”, the selector 88 selectively outputs the output of counter 83.
  • the selector 67 Based on the memory enable signal MEN whose value is set to "0”, the selector 67 selectively outputs the output of selector 68.
  • the forward read address signal READF whose value sequentially changes from "0" to "N-1" as shown in FIG.
  • Both of the sampling data outputted from the first and second waveform data storing portions WM1 and WM2 are multiplied together in the multiplier 71. Then, the multiplication result of multiplier 71 is added with the sampling data from the register 72 in the adder 73. Thereafter, the addition result of adder 73 is stored in the register 72 in synchronism with the master clock signal Cm.
  • This register 72 is reset by the inverted read/write control signal R/W outputted from the inverter 74 at every last timing of one sampling time.
  • the adder 73 and register 72 accumulates the multiplication result of the multiplier 71 during one sampling time.
  • the register 75 which is controlled by the inverted read/write control signal R/W inputs the accumulation result just before the register 72 is reset.
  • This register 75 outputs the above accumulation result as an output signal C shown in FIG. 6.
  • This signal C indicates the sampling data which obtained by executing the convolution operation on two sampling data during one sampling time.
  • sampling data indicative of the output signal C is supplied to the D/A converter 23 (shown in FIG. 2), wherein the sampling data is converted into the analog signal.
  • the sound system 24 generates the musical tone corresponding to the analog signal.
  • the musical tone to be generated by the sound system 24 is the result of the convolution operation between the musical tone waveform signal from the main waveform data generating circuit 14 and the impulse response characteristic of the room where the present keyboard electronic musical instrument is placed. Therefore, the generated musical tone simulates the reverberation characteristic of the room.
  • the present keyboard electronic musical instrument can preserve the waveform data of impulse response signal. Or, it is possible to use other pre-stored waveform data of impulse response signal of the room or places for the convolution operation.
  • the player operates several operation switches in the designating unit 38 to thereby designate the transfer of waveform data from the memory 47 to the waveform data memory 36 or external storing unit 37.
  • the designating unit 38 designates the transfer of waveform data from the waveform data memory 36 or external storing unit 37 to the memory 47.
  • the waveform data storing control circuit 34 outputs the memory address signal MADR whose value changes from "0" to "N-1" in synchronism with the master clock signal Cm.
  • this circuit 34 also outputs the memory enable signal MEN whose value is at "1" during N clocks (see FIG. 8).
  • This memory enable signal MEN is supplied to the selection control terminals SL of the selectors 67 and 68 respectively.
  • the selector 67 supplies the memory address signal MADR to the address input ADR of memory 47, while the selector 48 permits the data transfer between the waveform data storing control circuit 34 and data input/output terminal DATA of memory 47.
  • the waveform data storing control circuit 34 outputs the memory read/write control signal MR/W having value "1" in addition to the signals MADR and MEN.
  • the memory enable signal MEN takes the value "1" so that the AND circuit 65 outputs the inverted memory read/write control signal MR/W which is outputted from the inverter 66.
  • This inverted signal MR/W is further inverted by the NOR circuit 62 so that the signal MR/W is supplied to the read/write control terminal R/W of memory 47.
  • the read mode is set to the memory 47.
  • the sampling data are sequentially read from the memory 47 in response to the memory address signal MADR whose value changes from "0" to "N-1". Then, this sampling data is supplied to the waveform data storing control circuit 34 via the selector 48. Thereafter, the sampling data from the waveform data storing control circuit 34 is stored at the designated position in the waveform data memory 36 or external storing unit 37.
  • the present invention is not limited to use this impulse response waveform signal of the room. Instead, it is possible to use other waveform having the length which is similar to that of the impulse response waveform signal. In short, it is possible to preserve the waveform data concerning several external tones by the operations described above.
  • the waveform data storing control circuit 34 outputs the waveform data consisting of N sampling data and memory read/write control signal MR/W having value "0" in addition to the signals MADR and MEN, wherein N sampling data are read from the waveform data memory 36 or external storing unit 37.
  • the memory enable signal MEN sets the write mode to the memory 47 based on the memory read/write control signal MR/W.
  • the convolution operation circuit 16 executes the convolution operation between the musical tone waveform data from the main waveform data generating circuit 14 and another waveform data from the waveform data memory 36 or external storing unit 37.
  • the waveform data of impulse response signal waveform data concerning the acoustic characteristics of several kinds of amplifiers and plates (of piano, guitar etc.) or other waveform data concerning the musical instrument tone, animal cry or natural sound in the waveform data memory 36 or external storing unit 37.
  • the convolution operation is executed between the waveform signal A from the main waveform data generating circuit 14 and the waveform signal B from the sub-waveform data generating circuit 15, wherein both of these waveform signals A and B varied in lapse of time.
  • the main waveform data generating circuit 14 outputs the musical tone waveform data as the waveform signal A.
  • the first waveform data storing portion WM1 within the convolution operation circuit 16 circulatingly stores each of the sampling data of the waveform signal A by every sampling time.
  • the sampling data are sequentially outputted to the calculation portion CAL by every clock timing in each sampling time in such a manner that the newer sampling data is outputted after the older sampling data is outputted.
  • This operation in the second mode is identical to that of the first mode.
  • the second mode signal takes the value "1"
  • the sampling data from the sub-waveform data generating circuit 15 is outputted to the convolution operation circuit 16 as the waveform signal B under operation of the selector 17.
  • This sampling data is formed in the sub-waveform data generating circuit 15 and it indicates the musical tone waveform having the pitch frequency of the depressed key in the keyboard 11.
  • such sampling data is continuously supplied to the second waveform data storing portion WM2 in the convolution operation circuit 16.
  • the second mode signal MD2 having the value "1" is supplied to the AND circuit 56 via the OR circuit 58, while the inverted memory enable signal MEN from the inverter 64 is supplied to the AND circuit 63, wherein the inverted signal MEN takes the value "1".
  • the read/write control signal R/W is supplied to the selector 68, and the inverted read/write control signal R/W is supplied to the gate control terminal GC of gate circuit 52.
  • this inverted signal R/W is further inverted by the NOR circuit 62 and inverter 55, so that the read/write control signal R/W is supplied to the terminal R/W of memory 47 and the gate control terminal GC of gate circuit 54.
  • the selector 48 Due to the memory enable signal MEN having the value "0", the selector 48 permits the data transfer between the bus 51 and the data input/output terminal DATA of memory 47.
  • the oldest sampling data indicative of the waveform signal B is rewritten by the newest sampling data by every last timing of one sampling time as shown in FIGS. 9 and 11.
  • Such sampling data are sequentially and circulatingly stored in addresses 0, 1, . . . , N-1, 0, 1, . . . of the memory 47.
  • the selector 68 supplies the forward read address signal READF from the selector 88 to the address input ADR of memory 47 via the selector 67.
  • the first mode signal MD1 having the value "0” is supplied to the selection control terminal SL of selector 88, from which the output signal of adder 86 is outputted as the forward read address signal READF.
  • the adder 86 adds the write address signal WADR and the count value of counter 83 together, wherein the count value is incremented from "0" to "N” by every clock timing in one sampling time.
  • the calculation portion CAL executes the convolution operation on the two sampling data respectively outputted from the first and second waveform data storing portions WM1 and WM2, so that the output sampling data indicative of the output waveform signal C are sequentially outputted by every sampling time.
  • the sampling data from the first waveform data storing portion WM1 sequentially changes from the new to the older in one sampling time.
  • the sampling data from the second waveform data storing portion WM2 sequentially changes from the old to the newer. Therefore, the present instantaneous value and previous instantaneous value in each musical tone waveform signal are modulated together, so that the complicated and variable musical tone waveform signal is to be formed. Then, the sound system 24 outputs the musical tone corresponding to such musical tone waveform signal.
  • the second mode it is possible to obtain the musical tone having much variety which can not be obtained in the conventional apparatus.
  • the convolution operation is executed between the waveform signal A from the main waveform data generating circuit 14 and the external tone from the microphone 21, wherein the waveform signal A varies in lapse of time and the external tone waveform varies intermittently in lapse of time.
  • the value "1" is set to the third mode signal MD3 only but the value "0" is set to other first and second mode signals MD1 and MD2.
  • the external tone picked up from the microphone 21 is converted into the digital signal consisting of plural sampling data in the A/D converter 18.
  • the selector 17 supplies this sampling data to the convolution operation circuit 16 as the waveform signal B in synchronism with the sampling time.
  • the second and third mode signals MD2 and MD3 are supplied to the OR circuit 58 in parallel.
  • the convolution operation circuit 16 operates in this third mode.
  • the microphone 21 continuously inputs the external tone which is obtained by performing the musical instrument or which is obtained from the tone source other than the musical instrument.
  • the plural instantaneous values of the musical tone waveform signal from the main waveform data generating circuit 14 which changes from the present to the previous are respectively modulated with other plural instantaneous values of the external tone waveform signal which changes from the previous to the present, whereby the sound system 24 will generate the brand-new variable musical tone which is complicatedly modulated by the external tone.
  • the waveform data from the waveform data memory 36 or external storing unit 37 is temporarily transferred to the memory 47, and thereafter the operation of reading such waveform data is controlled and then the waveform data is supplied to the calculation portion CAL.
  • the waveform data pre-stored in the ROM is selectively and repeatedly outputted to the calculation portion CAL in the first mode.
  • the musical tone waveform signals are not directly outputted from the main waveform data generating circuit 14 and sub-waveform data generating circuit 15. Instead, it is possible to provide the adder in front of the D/A converter 23, wherein this adder adds each musical tone waveform signal and the waveform signal C from the convolution operation circuit 16 together.

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5144673A (en) * 1989-12-12 1992-09-01 Matsushita Electric Industrial Co., Ltd. Reflection sound compression apparatus
US5206446A (en) * 1989-01-18 1993-04-27 Casio Computer Co., Ltd. Electronic musical instrument having a plurality of tone generation modes
US5308916A (en) * 1989-12-20 1994-05-03 Casio Computer Co., Ltd. Electronic stringed instrument with digital sampling function
US5317104A (en) * 1991-11-16 1994-05-31 E-Musystems, Inc. Multi-timbral percussion instrument having spatial convolution
US5789689A (en) * 1997-01-17 1998-08-04 Doidic; Michel Tube modeling programmable digital guitar amplification system
US5814750A (en) * 1995-11-09 1998-09-29 Chromatic Research, Inc. Method for varying the pitch of a musical tone produced through playback of a stored waveform
US5880390A (en) * 1996-10-07 1999-03-09 Yamaha Corporation Reverberation effect imparting apparatus
US20090133566A1 (en) * 2007-11-22 2009-05-28 Casio Computer Co., Ltd. Reverberation effect adding device
GB2493030A (en) * 2011-07-22 2013-01-23 Mikko Pekka Vainiala Applying the timbral characteristics of a first sound signal onto a second sound signal
US20130301839A1 (en) * 2012-04-19 2013-11-14 Peter Vogel Instruments Pty Ltd Sound synthesiser
CN104318916A (zh) * 2014-09-30 2015-01-28 深圳市魔耳乐器有限公司 效果器的控制装置、控制系统及控制方法
US9202450B2 (en) 2011-07-22 2015-12-01 Mikko Pekka Vainiala Method and apparatus for impulse response measurement and simulation
FR3093856A1 (fr) * 2019-03-15 2020-09-18 Universite de Bordeaux Dispositif de modification audio d’un signal d’entrée audio, et procédé correspondant

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2616391B2 (ja) * 1993-06-11 1997-06-04 カシオ計算機株式会社 エフェクター内蔵電子楽器
JP4179268B2 (ja) 2004-11-25 2008-11-12 カシオ計算機株式会社 データ合成装置およびデータ合成処理のプログラム

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740450A (en) * 1971-12-06 1973-06-19 North American Rockwell Apparatus and method for simulating chiff in a sampled amplitude electronic organ
US3821714A (en) * 1972-01-17 1974-06-28 Nippon Musical Instruments Mfg Musical tone wave shape generating apparatus
US4200021A (en) * 1977-12-09 1980-04-29 Nippon Gakki Seizo Kabushiki Kaisha Electronic musical instruments which form musical tones by repeatedly generating musical tone waveform elements
US4373416A (en) * 1976-12-29 1983-02-15 Nippon Gakki Seizo Kabushiki Kaisha Wave generator for electronic musical instrument
US4476765A (en) * 1982-05-26 1984-10-16 Eurosil Electronic Gmbh Electronic music signal generator
US4679480A (en) * 1984-08-31 1987-07-14 Nippon Gakki Seizo Kabushiki Kaisha Tone signal generation device for changing the tone color of a stored tone waveshape in an electronic musical instrument
US4706291A (en) * 1985-06-25 1987-11-10 Nippon Gakki Seizo Kabushiki Kaisha Reverberation imparting device
US4715257A (en) * 1985-11-14 1987-12-29 Roland Corp. Waveform generating device for electronic musical instruments
US4803731A (en) * 1983-08-31 1989-02-07 Yamaha Corporation Reverbation imparting device
US4864625A (en) * 1985-09-13 1989-09-05 Casio Computer Co., Ltd. Effector for electronic musical instrument
US4882963A (en) * 1985-10-15 1989-11-28 Yamaha Corporation Electronic musical instrument with editing of tone data

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0690637B2 (ja) * 1986-07-07 1994-11-14 ロ−ランド株式会社 補間方法

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740450A (en) * 1971-12-06 1973-06-19 North American Rockwell Apparatus and method for simulating chiff in a sampled amplitude electronic organ
US3821714A (en) * 1972-01-17 1974-06-28 Nippon Musical Instruments Mfg Musical tone wave shape generating apparatus
US4373416A (en) * 1976-12-29 1983-02-15 Nippon Gakki Seizo Kabushiki Kaisha Wave generator for electronic musical instrument
US4200021A (en) * 1977-12-09 1980-04-29 Nippon Gakki Seizo Kabushiki Kaisha Electronic musical instruments which form musical tones by repeatedly generating musical tone waveform elements
US4476765A (en) * 1982-05-26 1984-10-16 Eurosil Electronic Gmbh Electronic music signal generator
US4803731A (en) * 1983-08-31 1989-02-07 Yamaha Corporation Reverbation imparting device
US4679480A (en) * 1984-08-31 1987-07-14 Nippon Gakki Seizo Kabushiki Kaisha Tone signal generation device for changing the tone color of a stored tone waveshape in an electronic musical instrument
US4706291A (en) * 1985-06-25 1987-11-10 Nippon Gakki Seizo Kabushiki Kaisha Reverberation imparting device
US4864625A (en) * 1985-09-13 1989-09-05 Casio Computer Co., Ltd. Effector for electronic musical instrument
US4882963A (en) * 1985-10-15 1989-11-28 Yamaha Corporation Electronic musical instrument with editing of tone data
US4715257A (en) * 1985-11-14 1987-12-29 Roland Corp. Waveform generating device for electronic musical instruments

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5206446A (en) * 1989-01-18 1993-04-27 Casio Computer Co., Ltd. Electronic musical instrument having a plurality of tone generation modes
US5144673A (en) * 1989-12-12 1992-09-01 Matsushita Electric Industrial Co., Ltd. Reflection sound compression apparatus
US5308916A (en) * 1989-12-20 1994-05-03 Casio Computer Co., Ltd. Electronic stringed instrument with digital sampling function
US5317104A (en) * 1991-11-16 1994-05-31 E-Musystems, Inc. Multi-timbral percussion instrument having spatial convolution
US5814750A (en) * 1995-11-09 1998-09-29 Chromatic Research, Inc. Method for varying the pitch of a musical tone produced through playback of a stored waveform
US5880390A (en) * 1996-10-07 1999-03-09 Yamaha Corporation Reverberation effect imparting apparatus
US5789689A (en) * 1997-01-17 1998-08-04 Doidic; Michel Tube modeling programmable digital guitar amplification system
US7612281B2 (en) * 2007-11-22 2009-11-03 Casio Computer Co., Ltd. Reverberation effect adding device
US20090133566A1 (en) * 2007-11-22 2009-05-28 Casio Computer Co., Ltd. Reverberation effect adding device
GB2493030A (en) * 2011-07-22 2013-01-23 Mikko Pekka Vainiala Applying the timbral characteristics of a first sound signal onto a second sound signal
EP2549473A1 (en) 2011-07-22 2013-01-23 Mikko Pekka Vainiala Method of sound analysis and associated sound synthesis
GB2493030B (en) * 2011-07-22 2014-01-15 Mikko Pekka Vainiala Method of sound analysis and associated sound synthesis
US8907196B2 (en) 2011-07-22 2014-12-09 Mikko Pekka Vainiala Method of sound analysis and associated sound synthesis
US9202450B2 (en) 2011-07-22 2015-12-01 Mikko Pekka Vainiala Method and apparatus for impulse response measurement and simulation
US20130301839A1 (en) * 2012-04-19 2013-11-14 Peter Vogel Instruments Pty Ltd Sound synthesiser
CN104318916A (zh) * 2014-09-30 2015-01-28 深圳市魔耳乐器有限公司 效果器的控制装置、控制系统及控制方法
CN104318916B (zh) * 2014-09-30 2018-06-05 深圳市魔耳乐器有限公司 效果器的控制装置、控制系统及控制方法
FR3093856A1 (fr) * 2019-03-15 2020-09-18 Universite de Bordeaux Dispositif de modification audio d’un signal d’entrée audio, et procédé correspondant

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